Flame-retardant polyurethane nano-cellulose reinforced material and preparation method thereof

Abstract

The invention discloses a flame-retardant polyurethane nano-cellulose reinforcing material and a preparation method thereof. The flame-retardant polyurethane nano-cellulose reinforcing material comprises 60-80 parts of isocyanate raw material, 80-120 parts of oligomer polyol raw material, 20-35 parts of a foaming agent, 2-3 parts of a foam stabilizer, 3-5 parts of an initiator, 2-4 parts of a chain extender, 1-3 parts of a cross-linking agent, 10-15 parts of a plant raw material, 5-10 parts of an epoxy resin, 8-13 parts of an inorganic flame retardant, 25-30 parts of a flame-retardant filler,and 5-6 parts of an accessory ingredient. According to the invention, the plant raw material and the epoxy resin are added into the formula, the plant raw materials can be used for preparing the nano-cellulose, and the nano-cellulose has excellent charring capacity and reinforcing effect, can improve the flame-retardant effect of the polyurethane foam board, and has excellent mechanical properties; and the epoxy resin has excellent bonding performance, high modulus, high strength and thermal stability, and can also play a role in 'forced mutual dissolution' and 'synergistic effect' with the nano-cellulose, so that the stability is improved, and the performance complementation is realized.

Description

technical field [0001] The invention relates to a flame-retardant material and a preparation method thereof, in particular to a flame-retardant polyurethane nano-cellulose reinforcement material and a preparation method thereof, and belongs to the technical field of flame-retardant materials. Background technique [0002] Polyurethane is often used in aviation, railway, construction, sports, etc. Polyurethane rigid foam is mainly made of isocyanate and polyether, and under the action of various additives such as foaming agent, catalyst, and flame retardant, through special It is a high-molecular polymer that is mixed with equipment and foamed on-site by high-pressure spraying. Polyurethane foam has two types: soft foam and hard foam. Among them, polyurethane rigid foam is a new type of synthetic material with thermal insulation and waterproof functions. It is mainly used in construction. Exterior wall insulation, roof waterproof insulation integration, cold storage insulatio...

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Problems solved by technology

[0003] Existing polyurethane foam has poor high temperature resistance, and is prone to deformation under high temperature for a long time, thereby reducing the heat preservation effect; existing polyurethane foam will burn and decompose in case of fire, and will produce a large amount of toxic smoke, which greatly endangers people's health. Property and life safety; although the existing polyurethane foam has a certain strength, its toughness is poor, and in some cases it cannot fully meet the engineering requirements, and it is easy to break during use

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